[1] UNIV NEBRASKA, DEPT CHEM, LINCOLN, NE 68588 USA
[2] TEXAS TECH UNIV, DEPT CHEM & BIOCHEM, LUBBOCK, TX 79409 USA
[3] UNIV GENEVA, PLANT PHYSIOL LAB, CH-1211 GENEVA 4, SWITZERLAND
[4] CIBA GEIGY CORP, BIOTECHNOL RES, RES TRIANGLE PK, NC 27709 USA
[5] UNIV GEORGIA, DEPT BOT, ATHENS, GA 30602 USA